Cylinder 12 Injector Circuit High
The P0295 code indicates that the powertrain control module (PCM) has detected a high voltage condition in the electrical circuit of the fuel injector for cylinder 12. This typically means the injector circuit has excessive resistance or a short to voltage, which can prevent the injector from operating correctly, leading to misfires and reduced engine performance.
1. Most Common Causes
- Faulty fuel injector on cylinder 12
- Short to voltage in the injector wiring or connector
- Corroded or damaged injector harness connector
- Failed PCM (rare)
2. Symptoms You Will Notice
- Engine misfire on cylinder 12
- Rough idle or hesitation during acceleration
- Check Engine Light illuminated
- Decreased fuel economy
3. Step-by-Step Diagnosis
Step 1: Use a scan tool to confirm the code and check for additional codes.
Step 2: Visually inspect the injector wiring and connector for cylinder 12 for damage, corrosion, or shorts.
Step 3: Measure the resistance of the injector; compare to manufacturer specs (typically 12-16 ohms).
Step 4: Check for voltage at the injector connector with key on; should be battery voltage on one pin.
Step 5: If wiring and injector are okay, test the PCM output for cylinder 12 injector driver.
4. Frequently Asked Questions
Is it safe to drive with this code?▼
It is not recommended to drive long distances as the misfire can damage the catalytic converter and cause poor performance.
How much does it cost to fix?▼
Repair costs vary; replacing an injector typically costs $150-$400 including parts and labor. Wiring repairs may be less.
5. Commonly Affected Makes
This is a generic OBD2 code, potentially applicable to any manufacturer using this diagnostic standard.